--- a/jdk/src/java.base/share/native/libfdlibm/e_hypot.c Sat Sep 26 09:22:07 2015 -0700
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,128 +0,0 @@
-
-/*
- * Copyright (c) 1998, 2001, Oracle and/or its affiliates. All rights reserved.
- * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
- *
- * This code is free software; you can redistribute it and/or modify it
- * under the terms of the GNU General Public License version 2 only, as
- * published by the Free Software Foundation. Oracle designates this
- * particular file as subject to the "Classpath" exception as provided
- * by Oracle in the LICENSE file that accompanied this code.
- *
- * This code is distributed in the hope that it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
- * version 2 for more details (a copy is included in the LICENSE file that
- * accompanied this code).
- *
- * You should have received a copy of the GNU General Public License version
- * 2 along with this work; if not, write to the Free Software Foundation,
- * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
- *
- * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
- * or visit www.oracle.com if you need additional information or have any
- * questions.
- */
-
-/* __ieee754_hypot(x,y)
- *
- * Method :
- * If (assume round-to-nearest) z=x*x+y*y
- * has error less than sqrt(2)/2 ulp, than
- * sqrt(z) has error less than 1 ulp (exercise).
- *
- * So, compute sqrt(x*x+y*y) with some care as
- * follows to get the error below 1 ulp:
- *
- * Assume x>y>0;
- * (if possible, set rounding to round-to-nearest)
- * 1. if x > 2y use
- * x1*x1+(y*y+(x2*(x+x1))) for x*x+y*y
- * where x1 = x with lower 32 bits cleared, x2 = x-x1; else
- * 2. if x <= 2y use
- * t1*y1+((x-y)*(x-y)+(t1*y2+t2*y))
- * where t1 = 2x with lower 32 bits cleared, t2 = 2x-t1,
- * y1= y with lower 32 bits chopped, y2 = y-y1.
- *
- * NOTE: scaling may be necessary if some argument is too
- * large or too tiny
- *
- * Special cases:
- * hypot(x,y) is INF if x or y is +INF or -INF; else
- * hypot(x,y) is NAN if x or y is NAN.
- *
- * Accuracy:
- * hypot(x,y) returns sqrt(x^2+y^2) with error less
- * than 1 ulps (units in the last place)
- */
-
-#include "fdlibm.h"
-
-#ifdef __STDC__
- double __ieee754_hypot(double x, double y)
-#else
- double __ieee754_hypot(x,y)
- double x, y;
-#endif
-{
- double a=x,b=y,t1,t2,y1,y2,w;
- int j,k,ha,hb;
-
- ha = __HI(x)&0x7fffffff; /* high word of x */
- hb = __HI(y)&0x7fffffff; /* high word of y */
- if(hb > ha) {a=y;b=x;j=ha; ha=hb;hb=j;} else {a=x;b=y;}
- __HI(a) = ha; /* a <- |a| */
- __HI(b) = hb; /* b <- |b| */
- if((ha-hb)>0x3c00000) {return a+b;} /* x/y > 2**60 */
- k=0;
- if(ha > 0x5f300000) { /* a>2**500 */
- if(ha >= 0x7ff00000) { /* Inf or NaN */
- w = a+b; /* for sNaN */
- if(((ha&0xfffff)|__LO(a))==0) w = a;
- if(((hb^0x7ff00000)|__LO(b))==0) w = b;
- return w;
- }
- /* scale a and b by 2**-600 */
- ha -= 0x25800000; hb -= 0x25800000; k += 600;
- __HI(a) = ha;
- __HI(b) = hb;
- }
- if(hb < 0x20b00000) { /* b < 2**-500 */
- if(hb <= 0x000fffff) { /* subnormal b or 0 */
- if((hb|(__LO(b)))==0) return a;
- t1=0;
- __HI(t1) = 0x7fd00000; /* t1=2^1022 */
- b *= t1;
- a *= t1;
- k -= 1022;
- } else { /* scale a and b by 2^600 */
- ha += 0x25800000; /* a *= 2^600 */
- hb += 0x25800000; /* b *= 2^600 */
- k -= 600;
- __HI(a) = ha;
- __HI(b) = hb;
- }
- }
- /* medium size a and b */
- w = a-b;
- if (w>b) {
- t1 = 0;
- __HI(t1) = ha;
- t2 = a-t1;
- w = sqrt(t1*t1-(b*(-b)-t2*(a+t1)));
- } else {
- a = a+a;
- y1 = 0;
- __HI(y1) = hb;
- y2 = b - y1;
- t1 = 0;
- __HI(t1) = ha+0x00100000;
- t2 = a - t1;
- w = sqrt(t1*y1-(w*(-w)-(t1*y2+t2*b)));
- }
- if(k!=0) {
- t1 = 1.0;
- __HI(t1) += (k<<20);
- return t1*w;
- } else return w;
-}